[Juliusolsson05]

Refs #372. #372 stays open for per-file caps, dropped counters, request-body mirroring and the synchronous write.

Bumps packages/codex-headless ae0e935 → d7d7a5d, the merge of Juliusolsson05/codex-headless#53. That range holds only #53's commits: plan, fix and two test commits. No package.json or lockfile change, so there is no lockfile resync.

Why

Codex proxy dumps (~/.config/agent-code/proxy/**/proxy-events.jsonl) have stored every response chunk as a decimal byte array. JSON.stringify runs Buffer#toJSON before the mirror's replacer sees the value. That is 3.65× the payload: in one recorded session file, 2,266 MiB of chunk lines held 621 MiB of bytes. A later snapshot of the same session measured 3.646×.

What merges

• Chunks are mirrored as base64 ({ _buffer_b64 }), as API.md always documented. The recorded bytes round-trip unchanged.
• For new sessions, chunk lines shrink to about 0.38× their old size. The same bytes re-encoded would take about 869 MiB instead of 2,266 MiB; the base64 alone is about 830 MiB, plus about 110 bytes of framing per event.
• Files already on disk are not rewritten, and they stay decimal until retention prunes them.
• No app code reads the chunk encoding. Debug bundles ship the raw 5 MiB tail, which now fits more events. The live adapter still gets the in-memory Buffer.

Tests

Package: responsesProxy.mirror.test.ts passes (6 tests), including the recorded chunk, a full-size chunk, a nested Buffer and a split UTF-8 chunk. The app diff is the gitlink only. npx tsc -b is clean.

Review

Three reviewers checked this app PR (A pointer and metadata, B app integration, C measurement). The package PR's own disposition is on codex-headless#53. Its fixture was sanitized under steering q36.

Residual

The proxy mirror still has no per-file cap and no dropped-write counter. It still mirrors request bodies, and it still writes synchronously inside emit (#372).

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[Juliusolsson05]

Final disposition (pre-merge), head 45fffac. Three independent reviewers, one round each, on the app PR: A (pointer and metadata), B (app integration), C (measurement and forensic value). The package change has its own disposition on codex-headless#53, merged as d7d7a5d.

Reviewer	Round 1	Round 2
A (pointer, metadata)	FIX-BEFORE-MERGE	—
B (app integration)	MERGE-READY	—
C (measurement)	MERGE-READY	—

I checked the pointer myself. The head's packages/codex-headless is d7d7a5d, the merge commit of codex-headless#53 (state MERGED), and the only file in the app diff.

Findings and dispositions:

• A, minor: the title and the commit subject said lowercase (refs #372), and the commit has no Refs #372 trailer.
  • The PR title is fixed; it now says "(Refs Bound Codex proxy mirroring and debug log pressure during Responses streams #372)".
  • Commit 1d43c75f still has the lowercase subject and no trailer. Not fixed, because that would need a history rewrite.
  • No title, body or commit says Fixes #372, so nothing auto-closes. This does not block.
• B: no findings. B noted two gaps in the app's existing tests; this PR does not touch that code, so neither is a regression here:
  • the debug-bundle tests mock the proxy reader;
  • the Codex launch tests run with useProxy: false.
• C, minor: the body's "those chunk lines drop to about 830 MiB" was wrong on two counts.
  • It is the base64 payload alone. With the per-event framing, C measured about 869 MiB.
  • Files already on disk are never rewritten; only sessions started after the bump write base64.
  • Fixed in the replacement body. The same sentence in the package plan doc (codex-headless) is not changed.
• C, package test gaps (belong to fix(activity): close stuck flags from JSONL replay at bootstrap_complete #53): no test makes the mirror write throw, and a mutant that skips super.emit survives. Not fixed here.

Residuals:

• Bound Codex proxy mirroring and debug log pressure during Responses streams #372 stays open. The proxy mirror still has:
  • no per-file cap;
  • no dropped-write counter;
  • full request-body mirroring;
  • a synchronous appendFileSync inside emit.
• Existing decimal-array dumps stay as they are until retention prunes them.

Merges through batch PR #1318 once every member passes its gate.

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